Molecular Clouds
Giant Molecular Clouds
How We See Them
Temperature
Collapse
100
They can live between 10 and 100 million years
How long can they live?
100
They can reach the mass of 100 thousand suns
How massive can giant molecular clouds be?
100
Infrared light can penetrate the clouds and observe the newly forming stars
What type of light can penetrate the clouds?
100
The cores are -263º celcius or 10-50º kelvin (-440 to -370 f)
What temperature are the clouds and their cores?
100
When a molecular cloud cannot maintain a higher gas pressure than the force of gravity being acted on it by itself
What begins the process of collapse?
200
They dissipate from stellar winds and heat from the stars inside the cloud
What do they eventually die from?
200
They can reach up to 300 light years in diameter
How large of a diameter can giant molecular clouds have?
200
With infrared spectroscopy we can observe the temperature and density of these areas
How can observe the temperature and density of these areas?
200
The temperature is set by the balance of the heating from ultraviolet radiation and cosmic rays against the cooling from the infrared radiation
How is the temperature set?
200
It is the behavior of a collapsing molecular cloud to fragment into smaller and smaller high-density clouds
What is the behavior of a collapsing star?
300
The average spiral galaxy (milky way) contains 1-2 thousand clouds
How many Molecular Clouds are there per galaxy?
300
They contain enough gas to produce hundreds of thousands of sun-like stars
How much gas can they have?
300
We can find the rate of collapse, and what molecules inhabit the star forming areas, and determine the molecules' abundance and distribution
What else can we do with infrared spectroscopy?
300
If a cloud is more dense with dust, then it blocks more starlight and therefore slows the heating process
What is something that could slow the heating process?
300
A star is born?
What happens when a molecular collapses?
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